Discovery of benzyne, <i>o</i>-C₆H₄, in TMC-1 with the QUIJOTE line survey

We report the detection, for first time in space, of a new non-functionalised hydrocarbon cycle direction TMC-1: o -C 6 H 4 (ortho-benzyne). derive column density this (5.0 ± 1.0) × 10 11 cm −2 . The abundance species is around 30 times lower than that cyclopentadiene and indene. compare benzyne with other pure hydrocarbons, cycles or chains, find it could be formed from neutral-radical reactions such as C 2 + CH CHCCH 5 , possibly through 3 CCH Hence, rich content observed TMC-1 arise bottom-up scenario involving few radicals abundant hydrocarbons recently revealed by QUIJOTE line survey.